P0117 BMW - Engine Coolant Temperature Sensor 1 Circuit Low

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Low engine coolant level
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Faulty engine coolant thermostat
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

When is the code detected?

An excessively low voltage from the sensor is sent to ECM.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0117 Bmw Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
OBDII Code P0117 Bmw - Engine Coolant Temperature Sensor 1 Circuit Low - AutoCodes.com

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P0117 BMW Comments

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